Hearing aid



FIG. 1 is a perspective view of a new design for a hearing aid;

FIG. 2 is a side view of the hearing aid shown in FIG. 1, the oppositeside being a mirror image.

FIG. 3 is a top view of the hearing aid shown in FIG. 1; and,

FIG. 4 is a bottom view of the hearing aid shown in FIG. 1.

What is claimed is the ornamental design for a hearing aid, as shown anddescribed.